<template>
  <div class="course">
    <Header></Header>
    <div class="main">
      <!-- 筛选条件 -->
      <div class="condition">
        <ul class="cate-list">
          <li class="title">课程分类:</li>
          <!--          <li class="this">全部</li>-->
          <li :class="{this:category===0}" @click="filter_courses(0)">全部</li>
          <li :class="{this:category===category_value.id}" @click="filter_courses(category_value.id)"
              v-for="(category_value, category_index) in category_list" :key="category_value.id">
            {{ category_value.name }}
          </li>

        </ul>

        <!--        <div class="ordering">-->
        <!--          <ul>-->
        <!--            <li class="title">筛&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;选: </li>-->
        <!--            <li class="default this">默认</li>-->
        <!--            <li class="hot this">人气</li>-->
        <!--            <li class="price this">价格</li>-->
        <!--          </ul>-->
        <!--          <p class="condition-result">共21个课程</p>-->
        <!--        </div>-->

      </div>
      <!-- 课程列表 -->
      <div style="text-align: center">
        <el-pagination
          background
          @current-change="pageChangeEvent"
          :page-size="5"
          @size-change="handleSizeChange"
          :page-sizes="[2, 5 ,10, 20]"

          layout="sizes, prev, pager, next ,jumper, total"

          :total="count">
        </el-pagination>
      </div>
      <div class="course-list">
        <div class="course-item" v-for="(course_value, course_index) in course_data" :key="course_value.id">
          <div class="course-image">
            <img :src="course_value.course_img" alt="" width="100%" height="210">
          </div>
          <div class="course-info">
            <h3><router-link :to="'/coursedetail/' + course_value.id + '/'">{{course_value.name}}</router-link> <span><img src="/static/image/avatar1.svg" alt="">{{course_value.students}}人已加入学习</span></h3>
            <p class="teather-info">{{course_value.teacher.name}} {{course_value.teacher.signature}} {{course_value.teacher.title}} <span>共{{course_value.lessons}}课时/{{course_value.lessons === course_value.pub_lessons?'更新完成':`已更新${course_value.pub_lessons}课时`}}</span></p>
            <ul class="lesson-list">
              <li v-for="(course_lesson_value,course_lesson_index) in course_value.get_lessons"><span class="lesson-title">0{{course_lesson_index+1}} | 第{{course_lesson_value.lesson}}节：{{course_lesson_value.name}}</span> <span class="free" v-if="course_lesson_value.free_trail">免费</span></li>
<!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码</span> <span class="free">免费</span></li>-->
<!--              <li><span class="lesson-title">01 | 第1节：初识编码</span> <span class="free">免费</span></li>-->
<!--              <li><span class="lesson-title">01 | 第1节：初识编码初识编码初识编码初识编码</span> <span class="free">免费</span></li>-->
            </ul>
            <div class="pay-box">
              <span class="discount-type" v-if="course_value.discount_name">{{course_value.discount_name}}</span>
              <span class="discount-price">￥{{course_value.real_price}}元</span>
              <span class="original-price">原价：{{course_value.price}}元</span>
              <span class="buy-now">立即购买</span>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer></Footer>
  </div>
</template>

<script>
import Header from "./common/Header"
import Footer from "./common/Footer"

export default {
  name: "Nbcourse",
  data() {
    return {
      category: 0,  //默认值为0
      category_list: [],
      course_data: [],
      filters: {},  //用来存放查询参数的
      count: 0, // 总数据量
    }
  },
  components: {
    Header,
    Footer,
  },
  created() {
    this.get_course_category_data();
    this.get_course_data();

  },
  methods: {
    pageChangeEvent(cpage) {
      console.log(cpage);
      this.filters.page = cpage;  //{page:3}
      this.get_course_data();

    },
    handleSizeChange(size) {
      // console.log('>>>>', size);
      this.filters.size = size;//{size:10}
      this.get_course_data();
    },
    filter_courses(course_id) {
      this.category = course_id;
      if (course_id === 0) {
        // this.filters = {};
        delete this.filters['course_category'];  // 删除分类过滤条件

      } else {
        this.filters.course_category = this.category;  // {course_category:3}
      }
      this.get_course_data();
      // console.log(this.category);
    },
    get_course_category_data() {
      this.$axios.get(`${this.$settings.host}/course/categorys/`)
        .then((res) => {
          this.category_list = res.data;

        })
        .catch((error) => {

        })
    },
    get_course_data() {
      this.$axios.get(`${this.$settings.host}/course/list/`, {
        params: this.filters,  //{course_category:3,page:3}
      })
        .then((res) => {
          this.course_data = res.data.results;
          this.count = res.data.count
        })
        .catch((error) => {

        })
    }
  }
}
</script>


<style scoped>
.course {
  background: #f6f6f6;
}

.course .main {
  width: 1100px;
  margin: 35px auto 0;
}

.course .condition {
  margin-bottom: 35px;
  padding: 25px 30px 25px 20px;
  background: #fff;
  border-radius: 4px;
  box-shadow: 0 2px 4px 0 #f0f0f0;
}

.course .cate-list {
  border-bottom: 1px solid #333;
  border-bottom-color: rgba(51, 51, 51, .05);
  padding-bottom: 18px;
  margin-bottom: 17px;
}

.course .cate-list::after {
  content: "";
  display: block;
  clear: both;
}

.course .cate-list li {
  float: left;
  font-size: 16px;
  padding: 6px 15px;
  line-height: 16px;
  margin-left: 14px;
  position: relative;
  transition: all .3s ease;
  cursor: pointer;
  color: #4a4a4a;
  border: 1px solid transparent; /* transparent 透明 */
}

.course .cate-list .title {
  color: #888;
  margin-left: 0;
  letter-spacing: .36px;
  padding: 0;
  line-height: 28px;
}

.course .cate-list .this {
  color: #ffc210;
  border: 1px solid #ffc210 !important;
  border-radius: 30px;
}

.course .ordering::after {
  content: "";
  display: block;
  clear: both;
}

.course .ordering ul {
  float: left;
}

.course .ordering ul::after {
  content: "";
  display: block;
  clear: both;
}

.course .ordering .condition-result {
  float: right;
  font-size: 14px;
  color: #9b9b9b;
  line-height: 28px;
}

.course .ordering ul li {
  float: left;
  padding: 6px 15px;
  line-height: 16px;
  margin-left: 14px;
  position: relative;
  transition: all .3s ease;
  cursor: pointer;
  color: #4a4a4a;
}

.course .ordering .title {
  font-size: 16px;
  color: #888;
  letter-spacing: .36px;
  margin-left: 0;
  padding: 0;
  line-height: 28px;
}

.course .ordering .this {
  color: #ffc210;
}

.course .ordering .price {
  position: relative;
}

.course .ordering .price::before,
.course .ordering .price::after {
  cursor: pointer;
  content: "";
  display: block;
  width: 0px;
  height: 0px;
  border: 5px solid transparent;
  position: absolute;
  right: 0;
}

.course .ordering .price::before {
  border-bottom: 5px solid #aaa;
  margin-bottom: 2px;
  top: 2px;
}

.course .ordering .price::after {
  border-top: 5px solid #aaa;
  bottom: 2px;
}

.course .course-item:hover {
  box-shadow: 4px 6px 16px rgba(0, 0, 0, .5);
}

.course .course-item {
  width: 1050px;
  background: #fff;
  padding: 20px 30px 20px 20px;
  margin-bottom: 35px;
  border-radius: 2px;
  cursor: pointer;
  box-shadow: 2px 3px 16px rgba(0, 0, 0, .1);
  /* css3.0 过渡动画 hover 事件操作 */
  transition: all .2s ease;
}

.course .course-item::after {
  content: "";
  display: block;
  clear: both;
}

/* 顶级元素 父级元素  当前元素{} */
.course .course-item .course-image {
  float: left;
  width: 423px;
  height: 210px;
  margin-right: 30px;
}

.course .course-item .course-image img {
  width: 100%;
}

.course .course-item .course-info {
  float: left;
  width: 596px;
}

.course-item .course-info h3 {
  font-size: 26px;
  color: #333;
  font-weight: normal;
  margin-bottom: 8px;
}

.course-item .course-info h3 span {
  font-size: 14px;
  color: #9b9b9b;
  float: right;
  margin-top: 14px;
}

.course-item .course-info h3 span img {
  width: 11px;
  height: auto;
  margin-right: 7px;
}

.course-item .course-info .teather-info {
  font-size: 14px;
  color: #9b9b9b;
  margin-bottom: 14px;
  padding-bottom: 14px;
  border-bottom: 1px solid #333;
  border-bottom-color: rgba(51, 51, 51, .05);
}

.course-item .course-info .teather-info span {
  float: right;
}

.course-item .lesson-list::after {
  content: "";
  display: block;
  clear: both;
}

.course-item .lesson-list li {
  float: left;
  width: 44%;
  font-size: 14px;
  color: #666;
  padding-left: 22px;
  /* background: url("路径") 是否平铺 x轴位置 y轴位置 */
  background: url("/static/image/play-icon-gray.svg") no-repeat left 4px;
  margin-bottom: 15px;
}

.course-item .lesson-list li .lesson-title {
  /* 以下3句，文本内容过多，会自动隐藏，并显示省略符号 */
  text-overflow: ellipsis;
  overflow: hidden;
  white-space: nowrap;
  display: inline-block;
  max-width: 200px;
}

.course-item .lesson-list li:hover {
  background-image: url("/static/image/play-icon-yellow.svg");
  color: #ffc210;
}

.course-item .lesson-list li .free {
  width: 34px;
  height: 20px;
  color: #fd7b4d;
  vertical-align: super;
  margin-left: 10px;
  border: 1px solid #fd7b4d;
  border-radius: 2px;
  text-align: center;
  font-size: 13px;
  white-space: nowrap;
}

.course-item .lesson-list li:hover .free {
  color: #ffc210;
  border-color: #ffc210;
}

.course-item .pay-box::after {
  content: "";
  display: block;
  clear: both;
}

.course-item .pay-box .discount-type {
  padding: 6px 10px;
  font-size: 16px;
  color: #fff;
  text-align: center;
  margin-right: 8px;
  background: #fa6240;
  border: 1px solid #fa6240;
  border-radius: 10px 0 10px 0;
  float: left;
}

.course-item .pay-box .discount-price {
  font-size: 24px;
  color: #fa6240;
  float: left;
}

.course-item .pay-box .original-price {
  text-decoration: line-through;
  font-size: 14px;
  color: #9b9b9b;
  margin-left: 10px;
  float: left;
  margin-top: 10px;
}

.course-item .pay-box .buy-now {
  width: 120px;
  height: 38px;
  background: transparent;
  color: #fa6240;
  font-size: 16px;
  border: 1px solid #fd7b4d;
  border-radius: 3px;
  transition: all .2s ease-in-out;
  float: right;
  text-align: center;
  line-height: 38px;
}

.course-item .pay-box .buy-now:hover {
  color: #fff;
  background: #ffc210;
  border: 1px solid #ffc210;
}
</style>

